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International Rectifier SupIRBuck IRDC3846 User Manual

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SupIRBuck
USER GUIDE FOR IR3846 EVALUATION BOARD
DESCRIPTION
The
IR3846
is
a
converter,
providing
performance and flexible solution in a small
5mmx7mm QFN package.
Key features offered by the IR3846 include
internal Digital Soft Start, precision 0.6V
reference voltage, Power Good, thermal
protection,
programmable
frequency, Enable input, input under-voltage
lockout for proper start-up, enhanced line/
load regulation with feed forward, external
frequency
synchronization
clocking, internal LDO, true differential
remote sensing and pre-bias start-up.

BOARD FEATURES

•
V
= +12V (+ 13.2V Max), No Vcc required.
in
•
V
= +1.2V @ 0-35A
out
•
F
=600kHz
s
•
L= 0.250uH
•
C
= 7x22uF (ceramic 1206) + 1x330uF (electrolytic)
in
•
C
= 6x100uF (ceramic 1206)
out
4/11/2013
This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results
of the continuing evaluation, this board can evolve and change without notice
TM
synchronous
buck
a
compact,
high
switching
with
smooth
Confidential
IRDC3846-P1V2
A thermally compensated output over-current
protection function is implemented by sensing
the voltage developed across the on-resistance
of the synchronous rectifier MOSFET for
optimum cost and performance.
This user guide contains the schematic and bill
of materials for the IR3846 evaluation board.
The guide describes operation and use of the
evaluation board itself. Detailed
information for IR3846 is available in the
IR3846 data sheet.
application
1
AL

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Summary of Contents for International Rectifier SupIRBuck IRDC3846

  • Page 1: Board Features

    IRDC3846-P1V2 SupIRBuck USER GUIDE FOR IR3846 EVALUATION BOARD DESCRIPTION IR3846 synchronous buck A thermally compensated output over-current converter, providing compact, high protection function is implemented by sensing performance and flexible solution in a small the voltage developed across the on-resistance 5mmx7mm QFN package.
  • Page 2 IRDC3846-P1V2 CONNECTIONS and OPERATING INSTRUCTIONS A well regulated +12V input supply should be connected to VIN+ and VIN-. A maximum of 35A load should be connected to VOUT+ and VOUT-. The inputs and output connections of the board are listed in Table I. IR3846 needs only one input supply and internal LDO generates Vcc from Vin.

  • Page 3: Top View

    IRDC3846-P1V2 CONNECTIONS and OPERATING INSTRUCTIONS LAYOUT The PCB is a 6-layer board. All of layers are 2 Oz. copper. The IR3846 and most of the passive components are mounted on the top side of the board. Power supply decoupling capacitors and feedback components are located close to IR3846. The feedback resistors are connected to the output of the remote sense amplifier of the IR3846 and are located close to the IR3846.
  • Page 4 IRDC3846-P1V2 4/11/2013 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results of the continuing evaluation, this board can evolve and change without notice...
  • Page 5 IRDC3846-P1V2 Schematic for Transient Load set up ExtLoadCtrl Vout Vout IRF6721 N/S OUT2 OUT1 MIC4452/SO8 N/S I-Monitor Vo_R_P Vo_R_N Optional transient load circuit 4/11/2013 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results of the continuing evaluation, this board can evolve and change without notice...

  • Page 6: Bill Of Materials

    IRDC3846-P1V2 Bill of Materials Item Qty Part Reference Value Description Manufacturer Part Number C71 C72 C73 C74 C75 C76 22uF 1206, 25V, X5R, 10% Murata GRM31CR61E226KE15L 0603, X5R, 25V, 20% C1608X5R1E105M 10uF 0603, X5R, 10V, 20% C1608X5R1A106M C10 C70 C130 0.1uF 0603, 25V, X7R, 10% Murata...
  • Page 7 IRDC3846-P1V2 TYPICAL OPERATING WAVEFORMS Vin=12.0V, Vo=1.2V, Io=0A-35A, Fsw=600kHz, Room Temperature, No air flow Fig. 2: Start up at 35A Load Fig. 3: Start up at 35A Load , Ch , Ch :PGood, Ch :Enable , Ch , Ch :PGood, Ch Fig.
  • Page 8 IRDC3846-P1V2 TYPICAL OPERATING WAVEFORMS Vin=12.0V, Vo=1.2V, Io=3.5A-14A, Fsw=600kHz, Room Temperature, No air flow Fig. 8: Transient Response, 3.5A to 14A step (2.5A/us) 4/11/2013 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results of the continuing evaluation, this board can evolve and change without notice...
  • Page 9 IRDC3846-P1V2 TYPICAL OPERATING WAVEFORMS Vin=12.0V, Vo=1.2V, Io=24.5A-35.0A, Fsw=600kHz, Room Temperature, No air flow Fig. 9: Transient Response, 24.5A to 35A step (2.5A/us) 4/11/2013 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results of the continuing evaluation, this board can evolve and change without notice...
  • Page 10 IRDC3846-P1V2 TYPICAL OPERATING WAVEFORMS Vin=12.0V, Vo=1.2V, Io=0A-35A, Fsw=600kHz, Room Temperature, No air flow Fig. 10: Bode Plot at 35A load: Fo = 100.6kHz; Phase Margin = 52.8º; Gain Margin = -17.2dB 4/11/2013 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results of the continuing evaluation, this board can evolve and change without notice...
  • Page 11 IRDC3846-P1V2 TYPICAL OPERATING WAVEFORMS Vin=12.0V, Vo=1.2V, Io=0A-35A, Fsw=600kHz, Room Temperature, No air flow Io [A] Fig.11: Efficiency versus load current Io [A] Fig.12: Power loss versus load current 4/11/2013 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results of the continuing evaluation, this board can evolve and change without notice...
  • Page 12 IRDC3846-P1V2 THERMAL IMAGES Vin=12.0V, Vo=1.2V, Io=35A, Fsw=600kHz, Room Temperature, No air flow Fig. 13: Thermal Image of the board at 35A load Test point 1 is IR3846: 98.8 Test point 2 is inductor: 72.9 4/11/2013 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results of the continuing evaluation, this board can evolve and change without notice...
  • Page 13 IRDC3846-P1V2 THERMAL IMAGES Vin=12.0V, Vo=1.2V, Io=35A, Fsw=600kHz, Room Temperature, LFM = 100 Fig. 14: Thermal Image of the board at 35A load Test point 1 is IR3846: 74 Test point 2 is inductor: 46.9 4/11/2013 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results of the continuing evaluation, this board can evolve and change without notice...
  • Page 14 IRDC3846-P1V2 IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 TAC Fax: (310) 252-7903 Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 4/13 4/11/2013 Confidential This evaluation board is a preliminary version meant for the engineering evaluation of the IR3846. Based on the results of the continuing evaluation, this board can evolve and change without notice...